Specifications

Appendices 47
Controlled Alarm Recording
When alarm recording is controlled by the multiplexer, the
VCR responds to the alarm signal provided by the multiplexer.
The recorder goes into the alarm recording mode and records
at the alarm record speed. It remains in the alarm mode until
released by the multiplexer. Controlled alarm recording
requires both video and alarm connections between the
multiplexer and the VCR.
System setup for multiplexer controlled alarm recording:
1. Connect the multiplexer vcr in and vcr out connectors to
the VCR’s video output and video input respectively.
2. Connect the VCR’s ground to the multiplexer alarms
connector pin 17 (alarm output common).
3. Connect the VCR’s alarm input to multiplexer alarms
connector pin 19 if VCR alarm input polarity is active low
or pin 18 if VCR alarm input polarity is active high.
4. Set the multiplexer ALARM DURATION option to the
minimum number of seconds you wish each alarm event
to be recorded.
5. Set the VCR’s alarm duration option to “manual”.
6. Set the multiplexer VCR ALARM RECORD TIME option
to match the VCR’s alarm recording speed. If using the
autodetect VCR speed feature (pin 37 on alarms
connector), the connections between the multiplexer and
VCR permit each unit to change recording speed as
needed. See Alarm Output and Autodetect VCR Speed for
details.
7. Set the multiplexer VCR RECORD TIME option to match
the VCR’s normal recording speed.